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12 pin SNES A/V male proprietary connector layout
12 pin SNES A/V male proprietary connector
at the cable
12 pin SNES A/V female proprietary connector layout
12 pin SNES A/V female proprietary connector
at the console
Available on the SNES, Nintendo N64, and GameCube.
Pin Name Description
1 R Red
2 G Green
3 CSYNC* Composite Sync*
4 B Blue
5 GND Ground
6 GND Ground
7 Y S-Video Y (Luminance)
8 C S-Video C (Chrominance)
9 CVBS Composite Video
10 +5V +5 VDC
11 L+R Left+Right Audio (Mono)
12 L-R Left-Right Audio (Used to calculate Stereo)
*CSYNC/Composite Sync is replaced by +12V on PAL SNES and PAL Gamecube consoles (But not the PAL N64) 
Not all signals are available on all systems:
Signal AV Famicom SNES SNES2 N64 GameCube NTSC GameCube PAL
Composite Video Y Y Y Y Y Y
S-Video N Y N Y Y N
RGB N Y N N N Y

Some AV cables have different internal components between regions:

Console Signal PAL NTSC
SNES Composite Video 75ohm resistor to ground on Composite Video Straight through to display
SNES S-Video Outputs S-Video but cable components (if any) are unknown at this time Straight through to display
SNES RGB 75ohm resistors to ground on R, G, B and Composite Video 220uF Capacitors* in series on R, G & B
N64 Composite Video 75ohm resistor to ground on Composite Video (and 220uF capacitor* in series is also recommended) Straight through to display
N64 S-Video 75ohm resistor to ground and 220uF capacitor* in series on Luma. 75ohm resistor to ground and 68nF capacitor in series on Chroma Straight through to display
N64 RGB Requires modification first - Only a certain early French model - 'NUS-001(FRA)' - can be modified easily. Any cable components will depend on the mod performed Requires modification first - Only early NTSC consoles can be modified easily. Any cable components will depend on the mod performed
Gamecube Composite Video 75ohm resistor to ground and 220uF capacitor* in series on Composite Video Straight through to display
Gamecube S-Video Does not output S-Video from the MultiAV port Straight through to display
Gamecube RGB 220uF Capacitors* in series on R, G & B. If you are going to watch/use the Composite video picture aswell (Scart connection) then you also need to use a 75ohm resistor to ground and 220uF capacitor* in series on Composite Video Does not output RGB from the MultiAV port. RGB can be obtained from the 'Digital AV Out' port by using a modified Component/D-Terminal cable. For more info see here.

*220uF capacitors are polarised, and it is important that the positive leg always goes towards the console and negative leg towards TV/Display.

The PAL SNES was internally revised 4 or more times during its lifetime. Later consoles used a different video encoder chip and supporting circuitry and 'appear' to work fine with an unmodified PAL Gamecube/NTSC SNES Scart cable (with capacitors)

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